Cap of an electric shaver



FIG. 1 is a perspective view, as viewed from above, of a cap of an electric shaver showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom view thereof. 

The ornamental design for a cap of an electric shaver, substantially as shown and described. 